| 摘要 |
A method for splitting samples of particulate matter (powders or suspensions), by which a powder or suspension stream of a sample is subdivided several times into subsamples and an analysis sample obtained therefrom, involves forming a powder or suspension stream rotating it centrifugally throwing off the stream and dividing it up several times into subsamples in the tangential throw-off direction and collecting divided subsamples, whereby one or more subsamples may be recycled into the stream of particles. An apparatus for carrying out this method (a sample splitter) comprises a central pipe which is capable of being rotatably driven, to which the powder or suspension is fed in batches, and which has a curved lower discharge end. In the throw-off area of the stream of particles centrifuged by this central pipe, a stationary ring of pockets is arranged for forming subsamples, these pockets being separated from each other by several, up to n=32, sharp-edged webs equally spaced in circumferential intervals and facing the stream of particles. Due to the displacement of the material away from the rotational axis of the central pipe, which increases towards the discharge end, a centrifugal effect is created which leads to an acceleration of the movement of the stream of particles to be split, thereby thinning or reducing the cross sectional area of the powder or suspension stream and promoting the separation of the particles.
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